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Pro­gres­sive en­hance­ment

Not ev­ery­one on the web has a fast con­nec­tion and up-to­date browser; pro­gres­sive en­hance­ment en­sures that con­tent is still ac­ces­si­ble by cre­at­ing a ba­sic markup doc­u­ment that can be viewed on prac­ti­cally any de­vice, then adding ex­ter­nally linked en­hance­ments as needed.